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Library / First Principles Framework (FPF) - Core Conceptual Specification
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C.25:15.1 - Availability family

A narrow service commitment may use AvailabilityRatio[%] as one characteristic. A broader availability family usually still needs a bundle because the claim depends on:

  • declared service and time scope,
  • observation and qualification window,
  • one or more mechanism slots such as failover or redundancy,
  • and evidence tying the measurement to declared observation conditions.

The bundle form makes it possible to distinguish “the measurement fell short” from “the measurement is fine but the declared mechanism prerequisite was absent”.